/* $PostgreSQL: pgsql/src/port/getopt.c,v 1.11 2007/03/26 21:44:11 momjian Exp $ */

/* This is used by psql under Win32 */

/*
 * Copyright (c) 1987, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *        notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *        notice, this list of conditions and the following disclaimer in the
 *        documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *        may be used to endorse or promote products derived from this software
 *        without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.      IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 */

#include <stdio.h>
#include <string.h>

#ifdef _MSC_VER
/* disable the following warnings
 * C4706: assignment within conditional expression
*/
#pragma warning(disable:4706)
#endif



int                     opterr = 1,                     /* if error message should be printed */
                        optind = 1,                     /* index into parent argv vector */
                        optopt,                         /* character checked for validity */
                        optreset;                       /* reset getopt */
char       *optarg;                             /* argument associated with option */

#define BADCH   (int)'?'
#define BADARG  (int)':'
#define EMSG    ""

/*
 * getopt
 *      Parse argc/argv argument vector.
 */
int
getopt(int nargc, char * const *nargv, const char *ostr)
{
        static char *place = EMSG;      /* option letter processing */
        char       *oli;                        /* option letter list index */

        if (optreset || !*place)
        {                                                       /* update scanning pointer */
                optreset = 0;
                if (optind >= nargc || *(place = nargv[optind]) != '-')
                {
                        place = EMSG;
                        return -1;
                }
                if (place[1] && *++place == '-' && place[1] == '\0')
                {                                               /* found "--" */
                        ++optind;
                        place = EMSG;
                        return -1;
                }
        }                                                       /* option letter okay? */
        if ((optopt = (int) *place++) == (int) ':' ||
                !(oli = strchr(ostr, optopt)))
        {
                /*
                 * if the user didn't specify '-' as an option, assume it means -1.
                 */
                if (optopt == (int) '-')
                        return -1;
                if (!*place)
                        ++optind;
                if (opterr && *ostr != ':')
                        (void) fprintf(stderr,
                                                   "illegal option -- %c\n", optopt);
                return BADCH;
        }
        if (*++oli != ':')
        {                                                       /* don't need argument */
                optarg = NULL;
                if (!*place)
                        ++optind;
        }
        else
        {                                                       /* need an argument */
                if (*place)                             /* no white space */
                        optarg = place;
                else if (nargc <= ++optind)
                {                                               /* no arg */
                        place = EMSG;
                        if (*ostr == ':')
                                return BADARG;
                        if (opterr)
                                (void) fprintf(stderr,
                                                           "option requires an argument -- %c\n",
                                                           optopt);
                        return BADCH;
                }
                else
                        /* white space */
                        optarg = nargv[optind];
                place = EMSG;
                ++optind;
        }
        return optopt;                          /* dump back option letter */
}